Water-base paint specially for disappearing cast mold

Abstract

The water-base dissolving mould casting special-purpose coating is formed from 700-850 portions of alumina, 150-300 portions of diatomaceous earth, 20-30 portions of bentonite, 0.5-2.,0 portions of industrial sodium carbonate, 5-15 portions of cellulose sodium, 30-40 portions of white emulsion, 10-20 portions of aluminium sulfate, 20-30 portions of iron oxide, 20-30 portions of starch, 0.1-0.2 portion of washing powder and 700-800 portions of water. Said coating possesses good imbibition property, good transmutation and flowability, uniform coating layer, high strength and other advantages.

Description

(1) Technical field

[0001] The invention relates to a special coating for water-based lost foam casting, which belongs to chemical products. (2) Background technology

[0002] Lost foam casting is a casting process in which plastic foam beads are used to make a model, poured under negative pressure, and the molten iron replaces the position of the model to cool and form it. Because the foam model is easily deformed during the molding process and the strength is not enough, it is usually painted on the outer surface of the model. The strength and rigidity can be improved by using a layer of paint, so that the combustion products and gases of the model can pass through the paint layer and be discharged into the molding sand under the action of negative pressure. The currently used paint has poor air permeability, rigidity, and brushability. Therefore product quality cannot be guaranteed. (3) Contents of the invention

[0003] The purpose of the present invention is to overc...